86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
package main
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import (
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"fmt"
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"io"
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"mime"
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"mime/quotedprintable"
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"net/smtp"
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"os"
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"strings"
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"time"
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)
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func main() {
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if len(os.Args) == 1 {
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fmt.Printf(`The source code for this program can be found at git.handmade.network/hmn/hmn/adminmailer
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The config data is compiled into the program. If you need to change the config,
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find the adminmailer package in the hmn repo, modify config.go, and recompile.`)
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fmt.Printf("\n\nUsage:\n")
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fmt.Printf("You must provide a subject and message to send.\nMessage must be provided in stdin.\n\n")
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fmt.Printf("%s [subject]\n\n", os.Args[0])
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os.Exit(1)
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}
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subject := os.Args[1]
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message, err := io.ReadAll(os.Stdin)
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if err != nil && err != io.EOF {
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fmt.Printf("Error reading input: %v\n\n", err)
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os.Exit(1)
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}
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err = sendMail(RecvAddress, RecvName, subject, string(message))
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if err != nil {
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fmt.Printf("Failed to send email:\n%v\n\n", err)
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os.Exit(1)
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}
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}
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func sendMail(toAddress, toName, subject, contentHtml string) error {
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contents := prepMailContents(
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makeHeaderAddress(toAddress, toName),
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makeHeaderAddress(FromAddress, FromName),
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subject,
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contentHtml,
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)
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return smtp.SendMail(
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fmt.Sprintf("%s:%d", ServerAddress, ServerPort),
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smtp.PlainAuth("", FromAddress, FromAddressPassword, ServerAddress),
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FromAddress,
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[]string{toAddress},
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contents,
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)
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}
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func makeHeaderAddress(email, fullname string) string {
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if fullname != "" {
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encoded := mime.BEncoding.Encode("utf-8", fullname)
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if encoded == fullname {
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encoded = strings.ReplaceAll(encoded, `"`, `\"`)
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encoded = fmt.Sprintf("\"%s\"", encoded)
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}
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return fmt.Sprintf("%s <%s>", encoded, email)
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} else {
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return email
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}
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}
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func prepMailContents(toLine string, fromLine string, subject string, contentHtml string) []byte {
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var builder strings.Builder
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builder.WriteString(fmt.Sprintf("To: %s\r\n", toLine))
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builder.WriteString(fmt.Sprintf("From: %s\r\n", fromLine))
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builder.WriteString(fmt.Sprintf("Date: %s\r\n", time.Now().UTC().Format(time.RFC1123Z)))
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builder.WriteString(fmt.Sprintf("Subject: %s\r\n", mime.QEncoding.Encode("utf-8", subject)))
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builder.WriteString("Content-Type: text/plain; charset=UTF-8\r\n")
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builder.WriteString("Content-Transfer-Encoding: quoted-printable\r\n")
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builder.WriteString("\r\n")
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writer := quotedprintable.NewWriter(&builder)
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writer.Write([]byte(contentHtml))
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writer.Close()
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builder.WriteString("\r\n")
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return []byte(builder.String())
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}
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